ENT-211 add course key v2#87

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zubair-arbi wants to merge 10 commits intomasterfrom

zub/ENT-211-add-aggregate-course-key

Commits on Mar 3, 2017

Commits on Mar 6, 2017

add tests for aggregate course locator
zubair-arbi
committed

Commits on Mar 7, 2017

remove serialize method in favor of _to_string + add from_course_key method to create aggregate course key from a course key object + add/update tests
zubair-arbi
committed

Commits on Mar 8, 2017

address feedback from clinton, part 1
zubair-arbi
committed

Commits on Mar 9, 2017

change naming formate from aggregate course key to course key v2
zubair-arbi
committed